ArticleLung India : official organ of Indian Chest Society
Primary mediastinal lymphomas, their morphological features and comparative evaluation.
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3 citing papers in PubMed, 18 citations in OpenAlex.
- Thinking Outside the Box in Mediastinal Lymphoma Management.Clinical hematology international · 2023Article
- Primary Mediastinal B-Cell Lymphoma: Novel Precision Therapies and Future Directions.Frontiers in oncology · 2021Review
- Diagnostic evaluation of mediastinal lesions: Analysis of 144 cases.Lung India : official organ of Indian Chest SocietyArticle
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6 authors at 1 institution in 2 countries.
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Abstract
backgroundPrimary mediastinal lymphoma is an uncommon tumor. Hodgkin's lymphoma (HL), primary mediastinal B-cell lymphoma (PMBCL), and T-lymphoblastic lymphoma are the most common primary mediastinal lymphomas. Key morphological and immunohistochemistry (IHC) features play a very crucial role in diagnosis as well as further categorization. MATERIALS AND
methodsIn this study, the morphological spectrum and histological features of 32 cases of primary mediastinal lymphomas diagnosed over 5 years were studied and morphological and IHC features of PMBCL versus HL were compared. Features of PMBCL were also compared against a control group of systemic diffuse large B-cell lymphoma.
resultsAlthough PMBCL and HL are known to show overlapping morphological features, it was observed that presence of clear cells and compartmentalizing fibrosis in PMBCL; and classical Reed-Sternberg cells and dense inflammatory background in HL are important morphological clues while evaluating the biopsies. PMBCL showed diffuse, strong and uniform CD20 positivity; whereas CD30 showed focal/patchy, weak to moderate and heterogeneous expression, wherever found positive. As against this, HL showed diffuse, strong and uniform CD30 positivity; and focal/patchy, weak to moderate and heterogeneous CD20 expression, if found positive. CD20, CD3, and CD30 were sufficient in most of the cases while diagnosing PMBCL and HL.
conclusionThis study emphasizes the critical examination of IHC markers. Only positive expression in neoplastic cells is not sufficient to make a diagnosis, equal importance should be given to percentage, intensity, pattern, and type of positivity. Apart from basic IHC described above; CD15, leukocyte common antigen and fascin played an important role in differentiating HL and PMBCL in select doubtful cases.
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